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How Does Pepsinogen Change into Its Active Form - Biology

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प्रश्न

How does pepsinogen change into its active form?

उत्तर १

Pepsinogen is a precursor of pepsin stored in the stomach walls. It is converted into pepsin by hydrochloric acid. Pepsin is the activated in the form of pepsinogen.

Pepsinogen  Pepsin + Inactive peptide

(Inactive) (Active)

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उत्तर २

The proenzyme pepsinogen, on exposure to hydrochloric acid, secreted by oxyntic cells of gastric glands gets converted into the active enzyme pepsin, the proteolytic enzyme of the stomach.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 16: Digestion and Absorption - Exercises [पृष्ठ २६७]

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एनसीईआरटी Biology [English] Class 11
पाठ 16 Digestion and Absorption
Exercises | Q 3.4 | पृष्ठ २६७

संबंधित प्रश्‍न

Match column I with column II

  Column I   Column II
a Bilirubin and biliverdin 1 Parotid
b Hydrolysis of starch 2 Bile
c Digestion of fat 3 Lipases
d Salivary gland 4 Amylases

Answer briefly:

How does bile help in the digestion of fats?


Describe the process of digestion of protein in stomach.


Name different types of teeth and their number in an adult human.


Which of the following sphincter controls the passage of food into the stomach?


Emulsification of fats is brought about by ______.


The food mixes thoroughly with the acidic gastric juice of the stomach by the churning movements of its muscular wall. What do we call the food then?


Trypsinogen is an inactive enzyme of pancreatic juice. An enzyme, enterokinase, activates it. Which tissue/ cells secrete this enzyme?/ How is it activated?


Name the enzymes involved in the breakdown of nucleotides into sugars and bases?


Correct the following statement by deleting one of entries (given in bold).

Goblet cells are located in the intestinal mucosal epithelium and secrete chymotrypsin/mucus.


Name the part of the alimentary canal where major absorption of digested food takes place. What are the absorbed forms of different kinds of food materials?


Correct the statement given below by the right option shown in the bracket against them.

Rennin is a proteolytic enzyme found in gastric juice in (infants/adults).


Correct the statement given below by the right option shown in the bracket against them.

Dipeptides, disaccharides and glycerides are broken down into simple substances in region of small intestine. (jejunum/duodenum)


Describe the enzymatic action on fats in the duodenum.


A person had roti and dal for his lunch. Trace the changes in those during its passage through the alimentary canal.


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